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My fork loses pressure when I remove the pump, what can I do?
Check the valve core tightness using a Schrader valve core tool.
My fork has negative travel, is this normal?
The BOS air spring is designed to lower the engagement threshold as much as possible. Therefore, it is
possible on some bikes that there will be a small negative travel.
Where can I buy original stickers or a valve cap?
These items and more are available in our online store.
My fork has bushing play from new, what should I do?
The unique bushing alignment and tolerance on BOS forks results in less friction, more sensitivity, and
some bushing play from new. If the bushing play feels abnormally excessive, please contact a BOS certified
service center for expertise.
My fork is lowering as I deflate it, what is happening?
When you deflate the fork by the Schrader valve, you are only emptying the positive air chamber. The
negative air chamber stays under pressure and exerts an opposing force on the air piston and pulls the fork
down. To avoid this phenomenon, deflate the fork in steps of 30-40 PSI and equalize the air chambers
between steps (compress and release the fork 5-10 times over the first 20mm – 1 inch) of travel.
I just inflated my fork for the first time and it is really hard, what can I do?
Have you equalized your fork’s air chambers? If not, check how it’s done in the setup section of your
product’s user manual.
Did you change your fork’s settings? Check that your low-speed and high-speed compression are at our
recommended base settings given in the setup section of your product’s user manual.
If you’ve equalized your fork, you may have some internal pressure from the production process. You can
eliminate this pressure by slipping a thin zip tie between your left dust seal and your stanchion until you
hear the sound of air escaping. Then reset your pressure and equalize your air chambers.
If you’ve tried all that and your fork is still hard, email customer service and they’ll give you a hand.
My fork was upside down or on its side and now it feels like there’s no hydraulic control.
Your cartridge has depurged – air has entered the hydraulic system. Open bath cartridges like the one used
in your fork allow air to mix with oil. The cartridge purges itself as you ride. You can purge the fork even
faster by cycling it through its full travel 5-10 times.
If it is becoming increasingly difficult to purge your cartridge, it may be time for an oil change. Contact your
closest BOS authorized service center for a basic or a full service.
I have about 5mm of travel unused when I ride normally.
Our forks are designed to be very progressive at the end of travel to give you a bottomless feeling. This
means that those last couple millimeters of travel might only be used on the biggest hits or when you case
a landing. You can think of them as insurance to get you out of the trickiest situations. If you have more
than about 5% of your travel unused, try lowering your air pressure by 5PSI and check your compression
settings. If your compression settings are much harder than our recommended values, try bringing them
closer to the base settings in your product’s user manual.
I have grease/oil coming out of my brand new fork seals.
This is not unusual at the beginning of the life of a fork. Clean off the stanchions and the seals and it will
stop after a few rides.
FAQ
